package mall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import mall.common.utils.PageUtils;
import mall.common.utils.Query;

import mall.product.dao.CategoryDao;
import mall.product.entity.CategoryEntity;
import mall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1、查出所有分类
        List<CategoryEntity> entitys = baseMapper.selectList(null);

        //2、组装成树形结构
        //2.1)找到所有的一级分类
        List<CategoryEntity> level1Entitys= entitys.stream()
                .filter(cate -> cate.getParentCid() == 0)
                .map(cate -> {
                    cate.setChildList(getChildList(cate ,entitys));
                    return cate;
                })
                .sorted((cate1,cate2) -> {
                    return (cate1.getSort()==null?0:cate1.getSort()) - (cate2.getSort()==null?0:cate2.getSort());
                })
                .collect(Collectors.toList());

        return level1Entitys;
    }

    @Override
    public void removeCategoryByIds(List<Long> asList) {
        //TODO 1、检查当前删除的菜单是否在别的地方引用
        //逻辑删除

        baseMapper.deleteBatchIds(asList);
    }

    //递归获得当前分类的子分类
    private  List<CategoryEntity> getChildList(CategoryEntity curr ,List<CategoryEntity> all){
        List<CategoryEntity> childList = all.stream()
                .filter(cate -> cate.getParentCid() == curr.getCatId())
                .map(cate -> {
                    cate.setChildList(getChildList(cate, all));
                    return cate;
                })
                .sorted((cate1, cate2) -> {
                    return (cate1.getSort()==null?0:cate1.getSort()) - (cate2.getSort()==null?0:cate2.getSort());
                })
                .collect(Collectors.toList());

        return childList;
    }

}